DKIM clash between Mailgun and MailChimp

Question

I have both a MailChimp and Mandrill account and for obvious reasons, I'm migrating from Mandrill to Mailgun, but keeping MailChimp for now.

MailChimp requires the following DKIM record (CNAME):

k1._domainkey.example.com -> dkim.mcsv.net

Mailgun requires the following DKIM record (TXT):

k1._domainkey.example.com -> k=rsa; p=REDACTED

But these DNS records can't coexist because they have the same host name. How can I continue to use both MailChimp (for marketing) and start using Mailgun (for transactional email) on the same domain?

Answer 1

Now is possible to change the DKIM Selector from the Domain Settings

Answer 2

The clashing subdomains was a coincidence. I deleted and recreated the domain in Mailgun and it gave me a totally different TXT record host - mailo instead of k1. No wonder Google wasn't my friend.