Not quite true as we need to compare result to original parent that breeder used.
Exactly… Technically speaking you are crossing
F1 x F1 = F2
so the result is F2 which has way higher variation (unless you are already working with “true breeding” (IBL) strains as @Subcool suggests, but that is highly unlikely).
@hempmex you can read a lot about it in GrowFAQ, for example: