Can starters with the same voltage and power rating be used interchangeably?
Not necessarily. For example, XTLSTR0074 and XTLSTR0089 are both rated at 12V and 1.4 kW with CW rotation, but they have different pinion tooth counts: 11 and 9 respectively. Their threaded mounting-hole counts also differ. Check the drive and mounting specifications alongside the OE Numbers and Equivalent Code before approving a replacement.