Differences between the variants of P-47D's

Back in the day there were only models of the P-47D bubbletop and the P-47D razorback. Now many of the model companies are differentiating between the various variants. I want to do a model of Neel Kearby’s P-47D-4. Is this any different than a P-47D-1 a P-47D-2 or a P-47D-5? All are razorbacks but are there any material differences between them. Miniart has some nice P-47D models I want to try but I want to get the right one.

Minor detail differences, with many being internal. From wiki

  • P-47D-RA, P-47C-2-RE or C-5-RE built at Evansville. Later extra cowl flaps and minor changes were added. 114 built including pre-production aircraft.[9][10] Sometimes referred to as the P-47D-1-RA.
  • P-47D-1-RE, Farmingdale equivalent of the late-P-47D-RA. 105 built.[8]
  • P-47D-2-RE, with turbo-supercharger shroud removed.[4] 445 built.[8]
  • P-47D-2-RA, Evansville equivalent of the D-2-RE. 200 built.[8]
  • P-47D-3-RA, with minor changes. 100 built.[8]
  • P-47D-4-RA, with a GE C-21 supercharger and water injection. Not quite up to C-5-RE standard.[4] 200 built.[8]
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I saw this in Wikipedia but it doesn’t give much information as to exterior appearance. What is the turbo-supercharger shroud? What does removing this do the the outside of the aircraft. Are there any differences in exterior appearance of the aircraft between the P-47D-1-RE and the P-47D-25 when the bubbletop appeared?

I can’t say for certain if the shroud is visible externally. Here are a bunch of diagrams of the turbocharger system

P-47 exhaust/turbocharger

Most other differences listed such as injection systems are internal.