Machine Design
An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

Tip of both gear and pinion
Tip of the pinion and flank of gear
Flanks of both gear and pinion
Tip of the gear and flank of pinion

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Power transmission does not depend upon open and crossed types of constructions
Open and crossed belt drives transmit same power
Crossed belt drive transmits more power than open belt drive
Open belt drive transmits more power than crossed belt drive

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