Tri-tip versus Flank Steak

I am making fajitas on the grill. My recipe calls for flank steak -- it is difficult to find in my area. Kroger had "Tri-tip" steak on sale so I went with that. I tried pounding it, although I didn't seem to make a dent in it. It is in the frig marinating right now.
Is this an ok substitution? Any tips on grilling this? I see it definitely has a grain, so we will have to be careful when cutting it.
I just hope it is not tough...

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