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Are all 64k x 4-bit ICs interchangeable for Amstrad-era ZX Spectrum 128k +2/+3?

I say "Amstrad-era" as these were produced by Alan Michael Sugar's Amstrad company, when Sugar bought the rights to the Sinclair name for computers only (he didn't buy the Sinclair name). … I do not include the Amstrad 128k grey in this question, as that is based on the Toastrack, whereas the +2A, +2B and +3 are new designs "under the hood". …
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