Again, there is nothing specific between the MAXX HD and the RAZR HD. They are the same hardware. Only the battery and storage is different which doesn't affect which ROM for RAZR HDs to install. Any rom for the RAZR HD will install on the RAZR MAXX HD. No ROM is made specific to either one. They are both XT926.
As far as flashing ROMs, you need to know the answer to the following question
Is your bootloader locked or unlocked?
If your bootloader is locked, then you are stuck using only Safestrap ROMs IF you are still on Jellybean. You cannot use TWRP or CWM regardless of whether or not you are on JB or KK. If you are on KK (via the OTA), then I do not believe the Safestrap recovery will work since it hasn't been updated to work with KK. Therefore, you are stuck using the stock KK image from the OTA and there's no going back to JB either with a locked bootloader.
If you are on JB, then you can use Safestrap to load the limited set of Safestrap ROMs to your phone. You MUST read each ROM carefully to see if it's Safestrap ready. If it's not, then it won't work with Safestrap.
Most ROMs are not Safestrap since at one point, you could unlock the bootloader for the RAZR HD/RAZR MAXX HD which allows you to use a different kernel since the bootloader is unlocked. Therefore, the majority of ROMs that are still being updated using either TWRP or CWM which are for unlocked bootloaders only. However, Motorola has patched the phones so that those that never unlocked the bootloader before the patch can now no longer unlock the bootloader. So, if you missed the boat on unlocking your bootloader and upgraded the OS before unlocking, you are stuck with a locked bootloader and there is NO other way to unlock it, ever. So, don't ask how to do it or if someone will find a way to do it. They won't. It's a done deal, and there's no way to do it.
If you upgraded to KK with an unlocked bootloader, then only CWM will work but there are no working KK-based ROMs (based off of the official OTA) yet. We have to wait for the official FXZ image to come out for KK before that happens. However, unlocked bootloaders can flash back to stock JB whereas locked bootloaders cannot.