Online Comparator.

[Grizzly]

Check out this link.
http://www.bock.de/en/refrigerant-calculator.html
A little bit basic, but may help someone!
You can change Temp scales so applicable to all.
Grizzly

[stufus]

Good find Grizzly

I much prefer an actual comparator to referance charts.
I'd give reps but you know how it is.
Cheers
Stu