Sprint Note 5 (SM-N920P) on AT&T

I am upgrading to the Note 8 and I was hoping to give my Note 5 (that I own outright) to my girlfriend who is on AT&T. I tested it out and configured the APN properly and I think all is well. There is some wonkiness is maintaining the LTE connection, though. I looked into it and it looks like there is a difference between the two models as far as the bands go.

Sprint Note 5 (SM-N920P):

 

Infra: 2G GSM,2G CDMA,3G WCDMA,3G CDMA,4G LTE FDD,4G LTE TDD;
2G GSM: GSM850, GSM900, DCS1800, PCS1900;
2G CDMA: CDMA800 ,USPCS1900;
3G UMTS: B1(2100), B2(1900), B5(850), B8(900);
3G CDMA: BC0(800), BC1(1900), BC10(800);
4G FDD LTE: B2(1900), B4(AWS), B5(850), B12(700), B25(1900), B26(800);
4G TDD LTE: B41(2500)

 

AT&T Note 5 (SM-N920A):

 

Infra: 2G GSM, 3G WCDMA, 4G LTE FDD;
2G GSM: GSM850, GSM900, DCS1800, PCS1900;
3G UMTS: B1(2100), B2(1900), B5(850);
4G FDD LTE: B1(2100), B2(1900), B3(1800), B4(AWS), B5(850), B7(2600), B8(900), B17(700), B20(800), B29(700), B30(2300)

 It looks like the Sprint variant lacks B1, B3, B7, B8, B17, B20, B29, B30

I don't think AT&T heavily uses all of these bands, though. My main question is - Functionally, what type of performance should I expect? Will she get satisfactory service from AT&T despite these missing bands?