i wouldnt have thought they would fight, i have 3 honey gouramis but have never kept sparkling gouramis.
to sex honeys, i prosume sparklings are the same, for females you should see a brown stripe through the middle of the gouramis body and for a male you should see a slight change of colour and then a dark stripe down there bottom fin and up there chest when both breeding.
other ways to tell them apart is that males have a more pointy top fin.
for other ways to sex them and information on sparkling gouramis ask or pm pipoodle, as she knows a lot about gouramis so id do that just to comfirm if she hasnt already replied x
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