Naruto's SM rasengan did something even "Enton Rasenshuriken" can't do...
Flame Bullet:
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Sage version:
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I'm not sure if these are the same exact jutsu, but heres a comparison. between some rasengans in and out of sage mode. I won't provide pictures for all of them.
Rasen shuriken can be thrown while in sage mode, while it cannot in base.
Seen below it looks like two are need for one mediumish sized rasengan and two need to hold it. In sage mode not only can he transform normal rasengan gigantic, but he also only needs one hand to hold it instead of two hands with two of him. The first was able to take out a human, while the second was able to aid in fighting the kyuubi along with a rasen shuriken. Also, this mediumish one isn't even in base form, so... ya. There should be an even vaster difference between it and sage mode gigantic rasengan. A normal rasengan can be found in various places if you want to compare.
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So I would say there is a difference in ability to create rasengan in comparison to size along with an ability to wield the rasengan more easily in sage mode. This is the most notable difference I can see, if extended to other sage mode users I would assume that they would be able to make their jutsu bigger and control it better (bigger doesn't necessarily mean stronger, but in this case their jutsu's will most likely get leagues stronger as well depending on the jutsu).
I realize this is a very limited comparison, but it would take hours to re-read chapters, these are just some differences I thought of rather quickly. You could also compare Jaraiya, kabuto, and cursed seal users.
Take Naruto strength in Sage Mode He was able to top Pain Giant Rhino'e charge then pick it up and toss it up in the air. Normal chakra would not allow Naruto to do that, or His speed when He intercepted a Pain attacking Tsunade and with one punch destroyed it. The Same for reflexes as He avoided the 3rd Raikage lightning spear. it not just His jutsu that are enhance but all His senses and body.
Here is a scan somewhat explaining about Sage Mode, and what it actually does(middle panel.) I am guessing there is more too it, but I'm not sure if this is exactly what you are looking for or not. I couldn't be bothered looking for it, but when Naruto was learning sage mode Pa showed him the difference in strength when he lifted that stone statue using his own sage mode. It also increases the user's pain threshold.
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They were talking about Frog Kata in that scan you know the Natural e energy field around Naruto that is invisible but increases the affects of his taijutsu. I am looking for changes in Ninjutsu.
Yeah I get that now sorry, but my assumption is that if these things are increased then it is logical to think that ninjutsu would be enhanced as well. By how much though I couldn't say, although when I think about it I do wonder if it actually makes his ninjutsu stronger or not. What I mean by this is that Sage mode allows him to make much larger variations of his jutsu's, like base mode Naruto can make an giant rasengan. But sage mode Naruto can make a super giant rasengan which would obviously be more powerful, but if he used the same size giant rasengan as a base Naruto. I think it would be the same, sorry if this makes no sense it did to me when I was typing it lol.
I am open to correction though![]()
SM powered RasenShuriken disintegrated the human paths also it expands.... base frs doesn't do that.