Replacing easy run with elliptical

I'm thinking about replacing 1 easy run a week with the elliptical. I read the section in the book on cross training, but it didn't mention if it's a 1:1 equivalent for time to running. It said HR will be 5-15 beats lower.

So if I normally do a 45 min easy run targeting 130 HR or less, would equivalent elliptical be 45 min targeting 115-125 HR or less?