Has anyone actually tried to compile the codes?
I think I compiled one of the four versions you posted.
How much memory do these things have?
– 32K Bytes of In-System Self-Programmable Flash program memory
– 1K Bytes EEPROM
– 2K Bytes Internal SRAM
Will I be told if the program/sketch exceeds the memory limits of the board?
FLASH, yes. SRAM or EEPROM, no.