Can existing KM TREX be used for NAKISA embedded search?

Hi, my customer is now considering about to implement NAKISA.

They already use KM with TREX.

NAKISA also requires TREX (embedded search).

Customer does not want to increase TREX server. So, they want to put together TREX server.

My question is,

is it available that existing standalone TREX can be reused for both NAKISA and KM?

If it is not available, please let me know the reason why existing TREX can not be used, especially I need technical aspects of reason.

ex.) Standalone TREX has not enough function for NAKISA embedded search.

Thank you and kind regards.

Mizuka.