SGH-M919 Device Identification and Possible Cross-flashes - T-Mobile Samsung Galaxy S 4

I have a Samsung Galaxy S4 device with model number SGH-M919. The device is using the Android 4.2.2 operating system.
The OEM specifications for the phone are available (remove the spaces):
Code:
ht tp://ww w.samsung.com/us/mobile/cell-phones/SGH-M919ZWATMB-specs
In general, references to Samsung Galaxy S4 models seem to be relating to models i9500, i9505, and i9506. Is the SGH-M919 a re-brand of one of the other models? If so, should cross-flash to one of the other models be possible?

There are as you've found many models of Galaxy S4. The M919 is the T-Mobile variant. It has antenna hardware and modem configuration to support the networks T-Mo uses. It happens to be a sibling to the i9505 variant and ROMs (not firmware) meant for the 9505 often work on the M919. Generally speaking, you can't cross flash firmware or ROMs from other models. Some ROMs are developed to be cross platform and work on several variants. Quite a few variants of the S4 for example the ATT i1337 have locked bootloaders so ability to flash things is strictly limited in any case.
Make sure to verify the actual model you have before flashing anything.
Marc

This thread provides instructions for flashing i9505 firmware. I used the following i9505 ROMs on my S4 with m919 firmware without problems, so you don't have to flash i9505 firmware:
http://forum.xda-developers.com/galaxy-s4/i9505-develop/rom-albe95-lollirom-official-1-0-t3049564
http://forum.xda-developers.com/showthread.php?t=2427629

Thanks to the responders thus far.
So I take it that ROMs from the i9505 are typically compatible with the M919. I am guessing the the modem firmware required might be different.
Are there true (not just cosmetic) differences in hardware between the i9505 and M919?
Also when flashing the i9505 ROM onto the M919, does the device still identify as SGH-M919?

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