Honestly I've never experienced any difference, zifnow. I've had plenty of collisions with my wingmen. If any, I have more collisions with them because I spend more time with my flight mates than going in circles with the enemy.

Note that not all collisions are fatalities - though that IS the way to bet. I've seen collisions where one plane was destroyed and one managed to limp away, or others where both limped away.