Backcross breeding phenos

Quick question, im crossing strains at the moment and i know about backcrossing to a degree, i have the white og strain in 3 different phenotypes f1, f2,f3 and f1pheno i used to reverse for male pollen..i know f1xf1 is consider backcross so youll get narrow pheno genetics but if you cross f1xf2, f1xf3 its still backcrossing but will it be hybrid of both or will it narrow down pheno genetics to get same f1xf2 and f1xf3??
 
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