Do already discovered prime chains make it more difficult to launch XPM clone?

Marketplace Primecoin
1

Let’s say somebody tries to launch XPM clone. Does he have somehow to take into consideration the already discovered prime chains? Do already discovered prime chains somehow make it more difficult to create a primecoin clone?

Thanks.

2

There already is an XPM Clone (Datacoin). As far as I know it doesn’t make it more difficult, the blockchain is different, and so the block hashes are (with high probability) different, and the generated primes are (with high probability) different.

It would be interesting if someone ran a comparison of the blockchains (DTC vs XPM) to see how many of the same prime-chains they’ve found. I expect <10, if any.