Well the big question there is do you use any RHEL addons.
RHEL base and SL are nearly identical except for. Slight lag on updates, and a few packages added to SL ‎for the labs.
The bad news is any thing beyond the base version of RHEL such as the HA addon is not included in SL
Essentially if you build your hosts with kickstarts you should have no problem creating SL clones of RHEL boxes.
I my self usually use SL in dev and RHEL in prod mission critical and or PCI environments.‎
‎
  Original Message  
From: Scott Dowdle
Sent: Wednesday, November 30, 2016 13:37
To: [log in to unmask]
Subject: Re: Migrating from RHEL to SL

Greetings,

----- Original Message -----
> Did anyone tried migrating from RHEL 7 to SL 7?
> I found some article in web but it doesn't look convincing. Official
> or semi/official instructions would be appreciated.

It is fairly easy to do... to move between RHEL, CentOS and SL... and probably OEL too. I've done it a few times but not something I do regularly nor recently. I'd recommend for your own piece of mind, you do it a few times in a virtual machine... small install... medium install... large install. I don't recall having any issues the few times I did it.

TYL,
-- 
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]