The 8.1 changes won’t just roll XP requirements back to those of 7.3.5, they’re actually rolling back to less than the 7.0 requirements for a pretty wide range of level brackets.
Here are some examples. Note the difference between 7.0 and 8.1.
Level 40
7.0 = 95,700
7.3.5 = 133,980
8.0 = 123,280
8.1 = 86,300
Level 50
7.0 = 134,300
7.3.5 = 188,020
8.0 = 182,480
8.1 = 117,700
Level 60
7.0 = 254,000
7.3.5 = 254,000
8.0 = 254,300
8.1 = 152,580
Level 70
7.0 = 405,000
7.3.5 = 405,000
8.0 = 337,060
8.1 = 219,090
Level 80
7.0 = 482,000
7.3.5 = 482,000
8.0 = 431,440
8.1 = 323,580
Level 90
7.0 = 596,000
7.3.5 = 596,000
8.0 = 542,590
8.1 = 406,940
Level 100
7.0 = 657,000
7.3.5 = 657,000
8.0 = 657,000
8.1 = 492,540
Level 110
7.0 = 717,000
7.3.5 = 717,000
8.0 = 717,000
8.1 = 537,730
7.0, 7.3.5 and 8.0 XP requirement listed here:
Current and 8.1 XP requirements here:
Edited for formatting.