Advice please

I知 changing my 6.5 CM rifle for another but have some loaded rounds (which I知 going to pull) which were neck resized only and also some primed cases ready to load which are similarly neck sized only. All cases were trimmed where required.

Am I correct in thinking that if I remove the decapping/ expander core section from a full length die and then resize the primed cases with it, then essentially those cases are FL resized and therefore ok to firstly try in the new rifle chamber to check chambering and extraction, and then load ?

Thanks