CO2 is CO2, but Trenchant is right in saying most paintball places can't fill big bottles. Most of us go to welding shops or ask the local fire department. I just exchange my bottles at a welding shop.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk