Hello Rajat,
Your understanding is correct. Wish you create Condition Table 667 for Pricing, SAP uses A667 to store the Condition Records you create for the Access.
Yes. It is possible to have Pricing Condition Table A667 and Output Condition Table as B667.
Also hope you know that Access Sequences are Cross client and will be available in all the clients on a system.
Thanks,
Jignesh Mehta