No Propylene is not the same as Propane. They are different at chemical/molecular level...
Chemically, Propane is C3H8
Chemically, Propylene is C3H6
The do exhibit similar flame/temperature characteristic though.....
In using one or the other the "sweet spot" where combustion is more complete (less glass contamination ) will vary.... One gasses "sweet spot" may be further out from the tip of torch then the other....
And as for the time of day having tanks filled, I doubt it makes much difference if any...
Dale
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