You're not comparing two treks.

We can show you the numbers, but we'd be doing you a disservice if we didn't say this first: Bijli Mahadev Trek and Shrikhand Mahadev Trek are not alternatives — they are different sports. One is a 1-day experience reaching 8,000ft, the other is 7 days reaching 18,570ft. If you're choosing between these two, one of them likely isn't an option for you yet.