If its a decent print, its more likely that it is the same chemist.
There are loads of common prints like the hofmann blotter for instance, that are used my multiple chemists to lay acid on, and are pretty easily available from blotter art sites.
Just because you have the blotter from the same chemist doesnt mean you will have the same experience though, there are tons of factors that could influence the trip. Even the strength of the acid could be different if the different sheets took different paths and passed through different dealers hands and all their different storage methods or lack of good storage methods. Depending on the chemist sheets are sometimes not laid evenly too, so one sheet could have tabs that are a bit weaker or stronger than others.....I am not sure on this one as I have no idea how the sheets are dosed with lsd, but I hear that it can sometimes be uneven.
Like Ismene says too, sometimes you can have tabs from the same batch and sheet and the trip is stronger or weaker than expected...