All equipment with DIN connectors should be wired in the same way, though as with any standard you soon find people who ignore it.
https://en.wikipedia.org/wiki/DIN_connector
You should be aware that the signal levels are lower in the DIN standard. Some manufacturers supported this, and some just used the RCA line levels.
DIN was indeed a convenient way to connect tape and cassette decks, and most manufacturers continued to support it long after it had fallen into disuse elsewhere.