I used to play at Fortunejack with two different devices (Personal Computer and Mobile Phone) and two different internet source (home internet service and regular phone internet service) so it may give different IP addresses, but it should not be a reason for suspecting me as alt account because I used to do it since long time ago and there was no problems at all.
This is not really good choices to make when it comes to use to different ips to gamble. Even though it is the same person that play with different ip but what gambling site see is always different person so I never want to play with different ip. Most site will have the chance to outcome players with this kind of strategy. We should follow this or we will never able to withdraw some big payout from them