Yes you can. The RLL is quite picky about receivers and bolt carrier specs as it was designed for the Colt SP1 gun and guns have deviated since then. The RLL works with no other conversion parts.
The RDIAS uses all conversion parts, some receivers have selector stops that prevent the rotation of the selector, some have what is called a high shelf which will need milled down to give clearance for the RDIAS to drop in. The worst gun to us is a Colt that sear blocked the receiver to prevent the use.
Expect to pay $3000 more for a RDIAS than you would for a full gun, they are more rare, and people pay a premium to give their gun a newish tactical look compared to being stuck with an old style receiver.