The only ones I can really say anything on are the F4Us.
F4U-1 - February, 1943
F4U-1D - Late 1944/Early 1945
F4U-1C - Mid 1945
F4U-4 - Mid 1945 (sometime after the 1C)
The F4U-1 is a very complicated matter. There was no definitive "Production Block" like what you have with the P-47s (so, no F4U-1A-5 or 1A-20). Upgrades and refinements were introduced to the production lines as they became available with no demarcation of when something changed, and finished aircraft were then retrofit in the field. As a result of this, the 1A designation was not originally an official variant, but was introduced later in production and "back dated" to cover changes to the F4U-1 after a particular S/N. Additionally, our F4U-1 is more of a hybrid. The R-1800-8(W) with the water injection (WEP) wasn't introduced until AFTER the change over to the 1A designation. Our F4U-1 should NOT have WEP (all F4U-1s and the first few F4U-1As used the R-1800-8 without water injection). What would be recognized as the F4U-1A first appeared in mid-1943 (maybe around June to August). However OUR 1A is from very late in the production that added the same paddle prop that was used in the 1D, (hence the improved acceleration and rate of climb of our 1A) c. mid to late-1944.