As if Delta didn't have enough permutations of the 752 already...

I looked for an answer in the 753 Mods Tracking Thread but didn't see anything clear other than my own post. Does Delta now have 2 versions of the 753? In particular, look at the seat maps for flights 1223 on 6/30 (ATL-SEA) and 2188 on 7/4 (SEA-ATL).

The seat map for Flight 1223 looks like a typical 753 and matches what Seatguru has. Flight 2188 looks reconfigured, with at least 2 changes that I can easily spot: 3 overwing exit rows instead of 2 (rows 27, 28, and 29, versus 26 and 27), and the last row of Y is a full row 49, not row 47 1/2.

Speaking of the 3 overwing exits: are these 3 real exit rows, with legroom to match, or is this like the infamous seats 19DEF on a 75X before EC was added? [that was a very non-fun flight ATL-SNA one time for someone 6'-3"]