Move-order issue in the Grunfeld: ...Nc6-a5 vs ...Nc6-e7 My question relates to certain lines given by Avrukh (2018).

[FEN "..."]   
1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5 5. cxd5 Nxd5 6. Nf3 Nb6 7. Nc3 Nc6 8. e3 e5 9. d5 


Here 9...Ne7 is the most popular move (88 games in the Chessbase Live database), when Avrukh gives the continuation 10. e4 Bg4 11 h3. Bxf3 12. Qxf3 0-0 13. 0-0.

while 9...Na5 is the second most popular move (22 games in the Chessbase Live database), when Avrukh gives the continuation 10. 0-0 0-0 11 b3.

[FEN "..."]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5 5. cxd5 Nxd5 6. Nf3 Nb6 7. Nc3 Nc6 8. e3 O-O 9. O-O e5 10. d5


10...Na5 is the most popular move (537 games in the Chessbase Live database), when Avrukh gives 11 b3, transposing to a line given under the first diagram.

10...Ne7 is the second most popular move (437 games in the Chessbase Live database), when Avrukh gives 11. e4 Bg4 12. h3 Bxf3 13. Qxf3, transposing to a line given under the first diagram.

Thus according to Avrukh it doesn't matter which move order is chosen.

Given that is the case, why in the top diagram 9...Ne7 is so much more popular than 9...Na5, whereas in the bottom diagram 10...Na5 is somewhat more popular than 10...Ne7?

Avrukh, Boris (2018). Grandmaster Repertoire 2A – King’s Indian and Grünfeld. Quality Chess.
Analyzing this position it seems like the N to the rim has potential issues getting back into the game. W will play b3 and both of the black N's on the Q side are very limited. 

After Ne7 the N gets back into the game via c8 and d6 playing an important role blockaiding the p at d5.

That is the best I could find. Transposing to the same position did not come up in my analysis so maybe I am missing something.