In that case, both answers will be considered as wrong (if both questions has no relation with each other in anyway). If the examiner checks your copy whole heartedly and if (s)he gets to know easily (which has higher chances as you also said that the mistake is noticeable) that you have attempted the two questions in such a way, then (s)he may give you marks depending on your drawing otherwise (s)he will cut the marks directly.

So, just pray for the best.