Qustions About Enfield Magazines

Are the follower and magazine follower spring the same for #1 Mark III* and #4 Mark I* magazines? If different, how do they differ? If different, can they still be used interchangeably? I know that the magazine bodies are different.

Thanks in advance for any replies.

Should be. The only difference is the number of locking lugs on the back.

If I remember correctly, the raised area of the mag follower (platform?) is longer for a #1 magazine, shorter for a #4.