There are exception to most rules. Some 5.7 wire kits will have straight plug boots, some will have 90's, some will have 45's. Might get lucky, like you did, might get completely wrong wires. You got wrong coil wire, meaning another trip to store or modifying what you have.
I always prefer correct, made to fit wire kits. Ignition misfires from ill fitting wire ends or wires cross firing or grounding will ruin your day.