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1394b - What's difference between versions of TSB81BA3 d / e and G4 code?

Other Parts Discussed in Thread: TSB81BA3E

Hi,

I'm in need to replace a pair of TSB81BA3 (that are gone cause improper plug connection.....), but with my complete ignorance about... I see now I can only buy updated versions, like the TSB81BA3d and TSB81BA3e.

My original one is a TSB81BA3 with a G4 on it (see photo here)

Can I change it with a newer version?   The G4 code stands for?  They have a memory or need to be programmed?