Napier didn't anywhere near 3500+ horsepower out of a Sabre in 1942. If we compare where the Sabre and the DB604 were in 1942, they were about even on horsepower. Napier did get 3500 HP out of the Sabre, but that didn't happen until nearly V-E day. I am sure the Luft46 guys would tell us the DB 604 would have been 'neck and neck' for power with the late model Sabres if development had continued past 1942 into 1945.
I would suggest that the Jumo 222 was another German equivalent of the Sabre.