Yes, any custom map can be switched back to at any time, as many times as you like.
jb4 and procede are piggybacks you install on the ecu. Cobb is a flash. I am guessing you havent heard about the others because you weren't looking in the right place or talking to fan boys. Piggies provide some more options than flashes but flashes provide access to ecu data that even piggies require a flash for at some point.
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp - @ 17 psi and 6,000 rpms) - FOR SALE
2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired
2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired
2003 and 2005 330i/ci zhp - Stock - Retired