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I think - and I'm no expert, so don't quote me on this - that as long as each speaker is wired the same, you'll be fine. If they're different then they'll be out of phase. I don't think there's any danger of damage.
I always thought this too but I accidentally wired them differently on my newish Denon recently and it went into Speaker Protection Mode. Could just be a cool gimmick of course.
I see you've had yours updated with a phono-plug input and a modern power socket - did you have to drill the case?
I think - and I'm no expert, so don't quote me on this - that as long as each speaker is wired the same, you'll be fine. If they're different then they'll be out of phase. I don't think there's any danger of damage.