Restaurants:
Animator's Palate on both
Rapunzel's Royal Table (Magic); Tiana's Place (Wonder)
Lumiere's (Magic); Triton's (Wonder)
Lounges:
Promenade Lounge (Magic); French Quarter Lounge (Wonder)
Fathoms (Magic); Azure (Wonder)
Keys (Magic); Cadillac Lounge (Wonder)
O'Gills Pub (Magic); Crown and Fin (Wonder)
Pool deck quick service locations are the same, with the exception of Duck-In Diner on the Magic being Pete's Boiler Bites on the Wonder.
As has been pointed out, the Magic has the Aquadunk water slide. The Wonder does not have anything similar. Both have the Twist 'n' Spout. There are some differences in the layout of the Concierge Lounge (the Magic has an outdoor part on Deck 10, whilst the Wonder's CL is entirely enclosed on that deck). The Wonder has a children's play area in the D Lounge, which is instead in the Promenade Lounge on the Magic - it was moved on the Wonder when the French Quarter Lounge was installed.
The only other differences I can think of are furnishing variations in public areas (eg floor tiles, carpeting).
Was on the Wo derby on Oct and was worse
Disney cruise ever. Lots of people complained so hopefully the fixed it.
I was on the Wonder for the Panama Canal cruise in November and it was easily my worst Disney cruise as well. To the point that I don't think I will sail with them again until the Wish is in service.