Can this be done..
pcv6.net. IN A 75.51.146.71/24
pcv12.net. IN A 75.71.100.100/24 ;numbers are just made up
pcv6.net. IN AAAA 2001:470:1F04:1AF2::2
pcv12.net. IN AAAA 2001:470:1f04:1AC2::64 ;numbers are just made up
No, but not for the reason you think. You seem to be hung up on segments - a forward zone file can have any number of IPv4 and IPv6 address spaces. But a zone file containing records for a different domain will do nothing; it will ignore those extraneous entries.
So you can have this:
pcv6.net. IN A 75.51.146.71
pcv6.net. IN A 75.71.100.100
pcv6.net. IN AAAA 2001:470:1f04:1AF2::2
pcv6.net. IN AAAA 2607:f388:2:6000:ee:d2:e6:c0
But you can't have this:
pcv6.net. IN A 75.51.146.71
pcv7.net. IN A 75.71.100.100
pcv8.net. IN AAAA 2001:470:1f04:1AF2::2
pcv12.net. IN AAAA 2607:f388:2:6000:ee:d2:e6:c0