Check the actual keys in a keycap kit
Look for the Enter shape, left and right Shift widths, bottom-row modifiers and spacebar width. A kit that fits one full-size ANSI board may still lack the short right Shift or 1-unit modifiers used by a compact board.
Keycap support and keyboard switch-mount compatibility are separate checks. Match the key shapes and widths to your board before replacing caps.
Physical shape and typed language
ANSI and ISO describe physical positions. QWERTY, AZERTY and QWERTZ describe letter arrangements, while the selected input source determines the delivered characters. Changing the input language does not change the shape of Enter.
If a key produces a different character from its legend, compare the selected input source in the layout checker, then change the operating-system setting if needed.
Japanese JIS differences
JIS uses a tall Enter, a shorter right Shift and extra symbol positions. Its bottom row contains conversion/input-mode keys around a shorter spacebar. Japanese character entry also depends on the selected input method.