Standard Definition DVR - DirecTV

We have DirecTv HD with Genie DVR, etc., at the house but are happy with Standard Definition in our RV. We have a D12-100 SD receiver in the RV which we own, it is on my account equipment list, but it does not have DVR feature. I bought a DirecTv R22-100 SD DVR receiver at an estate sale and plan to install it in the RV myself. I cannot find a SD DVR on the current DirecTv website equipment list. The questions: Can I simply remove the DirecTv card from the D12 receiver and insert it into the R22? Will it work? Will DirecTv recognize it and view it as legal?

This question, "Standard Definition DVR," is about DirecTV channels, programming, equipment, and sports.