Decision mining with non-fix # of att & diff life cycles?

Each activity in my log has a start and complete event. The number of attributes for the same activity will vary in the start and complete event. See the attached example. 

First question, is it ok to have different number of attributes for the same activity? Any drawbacks for it?
My second question, i’m trying to do some decision mining using “Discovery of the Process Data-flow (Decision-Tree Miner)” plug-in. Will it be able to handle start & complete events for each activity with different # of att?
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