It's not really "bad" as long as get the same style tread pattern.
You want to know that the front and rear of the bike will maintain the line similarly in a turn or when you hit those staight grooves in the road. It can be pretty scary having one end on the bike twitching around while the other stays in place.
I really do think that the smaller front would be OK, but I just can't say for sure and I don't want to put anyone in a bad spot if I am wrong. I'd hate to cost someone the money and, very doubtfully but at least possibly, put them in danger.
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