They would be very similar, but were it me, I'd hold out for a Hell Razor. Mine is a bit thicker than the advertised 3/16th's" and the "CBT" (Corrugated Bevel Technologoy....um, the grooves on the side of the blade) would make it a far better prying tool. (like prying open a window or door)
That said, Busse themselves recommend the SJTAC to military folks that aren't sure what they'll need a knife for.
Not having been to the sandbox, I can only speculate about what might work best. Knife Combat, E&E and SERE probably aren't high on the list of probabilities, but I could easily see a need for prying windows and doors and punching a hole thru a cinder block wall to shoot thru. For these, I'd prefer a Hell Razor.
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