grammar - plural or singular in this sentence

1. The product and the scale have changed from a small prototype to many production units.





2. The product along with the scale has changed from a small prototype to many production units.

Can sentence-1 be seen as incorrect, perhaps semantically, because it uses plural "have" but applies to "a" small prototype?

The issue that the plural "the product and the scale" is being applied to a singular predicate noun of "a small prototype." While the subject (product and scale) is plural and agrees with the verb (have), it does not agree with the predicate noun (a small prototype).