Yes, you can keep two conches in your puja room—one for blowing shankh for pooja and the other for Abhishek. The Dakshinavarti Shankha (right-facing conch) is highly revered in Hindu rituals, especially for performing Abhishek, a sacred bathing ritual of deities. https://www.radheshyamtulsimala.com/shankh-ke-liye-vastu-ke-niyam/