tool path / G code differences

Wondering why it is that G code opened in one controller software
package [IE: TurboNC, Mach 5, Flashcut] does not give the same results as
when opened in another.
More specifically ....... I generated G code for tool paths created in
Mastercam and opened the file in TurboCNC and all was good. Opened the same
Gcode file in Mach5 and get "radius too small to complete operation" errors,
opened it then in Cutviewer mill [I know this is not a controller program]
and it shows tool collisions every where. Flashcut claimed un recognized
commands.
Is not Gcode universal?
Respectfully,
Owen Lloyd
#111cmra
#34wmrc
"Enjoy Life, Race a Yamaha."
www.sportbikewest.com