Todjaeger
Potstirrer
CAMM-ER isn't "a possible ER version which has similar range to ESSM". It exists. Test firings to qualify it have been done, It's on order for the Italian army & AF & an unnamed foreign customer (thought to be Pakistan IIRC).
The possible extended range version is CAMM-MR, a proposed >100 km range joint development by the UK & Poland.
It is my understanding that the CAMM-ER missile is somewhat longer than the original Sea Ceptor missile. This in turn raises the question of whether or not a CAMM-ER missile can fit into one of the Sea Ceptor VLS cells, which triggers a whole line of questions about whether the two missiles can be swapped back forth interchangably. Given that the -ER version is still referred to as CAMM-ER, and not Sea Ceptor-ER, I do not take it as a given that a vessel fitted for Sea Ceptor can swap over to CAMM-ER.