I believe the table from Ray Wagner above via Eagledad is for ETO only, but Ray just published the tables in his book and gives overall references. I have no idea where the data came from specifically. My copy of his book doesn't give me the table references. It is labeled as ETO-only. The ETO was broken out for US ground forces as Europe, north of Italy and the Mediterranean.
So, Italy was considered as MTO along with North Africa by the people who defined the US Theaters of Operations. They also didn't have a PTO. The Navy also didn't have a PTO (and didn't save the same data as the USAAF in any case). They had Central Pacific and Southwest Pacific. The Northeast Pacific was considered as part of the Alaska Theater of Operations.
Well the Osprey books (and the aggregated numbers on the "Warbirds and Airshows" page linked above) are pretty well documented on their numbers for claims. Actual real verified victories of course is another matter. But the numbers for several aircraft types between Osprey and Wagner vary by about 20%. So I thought maybe they were distinguishing between claims in North Africa vs. claims in Italy (including Sicily, Sardania and Lampedusa / Pantelleria) which is technically Europe, whereas Tunisia is not. Those Islands in particular are where a lot of the USAAF victories were scored in the Med, and in Italy in fairly intense air combat up to the time of Anzio. By comparison USAAF was only fighting in North Africa for a few months and most of that in limited numbers.
P-38 European + MTO claims should be 1928 (1431 Med and 497 ETO) vs. 1,758 in the Ray Wagner numbers (spreadsheet)
P-40 European + MTO claims should be 592 (all Med) vs. 481 in the spreadsheet
P-39 European + MTO claims should be 27 (25 Med and 2 ETO) vs. 14 in the spreadsheet
US Spitfire European + MTO claims should be 379 (364 Med, 15 ETO) vs. 256 on the spreadsheet
P-47 European + MTO claims should be 2,948 (263 Med + 2685 ETO) vs. 3,082 on the spreadsheet
P-51 Eurpopean + MTO claims (including A-36) should be 5,302 (1,063 Med + 4,239 ETO) vs. 5,034 on the spreadsheet (P-51 + A-36)
P-61 European + MTO just about matches 59 vs. 58
P-47 and P-51 seem to be pretty close - they only fought in Italy not really in North Africa (a few A-36 sorties but i don't think any claims there)