The short answer is no.
The long answer is... Every well known glider diet uses a specific calcium source which shouldn't be substituted. The calcium the diet uses is calculated into the calcium to phosphorous ratio ( 2:1 ) which we think is the optimum ratio for calcium absorption.
If you change brands or type of calcium you are changing the ratio of the diet and amount of calcium per serving. Which could then be to much or to little, to much is just as dangerous as not enough.
When I was new new, before I understood diets... I read about egg shell calcium and tried to make some. Even when ground a lotttttt it is not fine enough. It's gritty and there are chunks of really sharp as shattered glass shards I wouldn't feed my gliders. Just not worth the effort and risk to save 12 bucks.
The better option is to chose a well known widely used diet like bml or critter love and follow the directions and ingredients exactly with no substitutions UNLESS the creator of the diet specifies a substitution with a suggested comparable substitute.