Two different types of Knapweed?

Two different types of Knapweed?

Observation - Two different types of Knapweed?. Description: This knapweed looked a little different to me, but I am terrible at distinguishing plants and wondered if anyone could help please? Images 1a and b are the same plant and 2 is the second plant. The same type or different? Any help appreciated... Thank

This knapweed looked a little different to me, but I am terrible at distinguishing plants and wondered if anyone could help please? Images 1a and b are the same plant and 2 is the second plant. The same type or different? Any help appreciated...
Thanks.