fluid cross-contamination

I changed transfer case fluid on my wife's RDX today. I used the same transfer pump that I used a year ago to do the rear differential.I doubt there is much left in the pump itself after a year, but just in general, is there a danger of using the same pump for 2 different fluids? Do people clean it afterwards and if they do, then with what?

I also used a new funnel for transmission fluid change, should I designate it as transmission funnel going forward? I feel like using it for regular engine oil would be a problem...