"Hey Jacques, where is zat 40593 neck zat goes wiz ze sax"?That is very peculiar indeed! It's not unheard of good horns having a non-matching neck because the original got damaged or lost, but a replacement neck within 3 units of at the body serial number is indeed very odd!
"Je ne sais quoi - take zis one. It's almost ze same".
2 hours later - looks on floor