What you should do is just buy another kit and run a control experiment with EC-1118. That would be the only way to know for sure.
The downside is that you would have even more Malbec to drink. What a shame!
I used BM4x4 once. It started very slowly. Almost prepared to pitch EC1118 in Day 2 to save the batch. Fortunately, I held the tempt. Fermentation started in day 3. Haha.
After it started, it went very vigorously and finished pretty dry. So far it is still in carboy in clearing phase.
I cannot tell the difference, to be honest. A sales guy in a home winemaking shop said only a few sommoliers or trained wine tasters can tell the difference. But anyway, I bought some different yeasts to try for fun or for psychological satisfaction to be precise. I never have the patience to do a controlled side by side test, since I never try the same wine kit twice. Haha.
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