If you use the same profile pic across your accounts, we’ll know it’s you.
With regard to managing privacy on the wiki: I’m not really sure why this would be an issue, or rather, why it would be different from any other space. If you’re really concerned, you can use a pseudonym there too. It’s pretty innocuous content though – just some definitions – so I wouldn’t be too concerned.
If you have privacy concerns, feel free to contact me by email and we can discuss.