2 things to note.
1) Unless you can actually convince your centre to put out a sport condition, you'll more than likely have practice on what you're given as a day to day shot. From what you've said in your posts, this sounds quite challenging as it is, and yet you're still bowling well on it.
2) George Freeman wrote this article
in his tips page on the sport condition. To quote him from that article... there is no one "Sport Condition". The sport program is a different set of criteria that must be adhered to for a particular pattern to be deemed "sport compliant". To oversimplify, a sport condition is a pattern that has a 2:1 ratio of oil or less.
From this you can see that just because you've bowled on a sport condition in one centre, doesn't mean you'll get exactly the same shot in another centre. The sport condition (like all patterns) is centre specific
and as such cannot be relied upon to be consistent across different centres (and sometimes across different lanes)
Essentially, if you are capable of making your spares, and (as Anakin said) having a strong mental game, you should do well, irrespective of whether you've seen the condition before.
Best of luck.