Caroline
You have absolutely nothing to worry about at all. Both are highly reputable tour operators who will be merging their operations together over the next year.
From a customer point of view you should experience little if any difference in your holiday, especially if you are travelling prior to the Winter season which begins on the 01st November.
Rest easy and enjoy your break.
Bob
For further assistance please e-mail me at;
bob.atkinson @ travelsupermarket.com (remove the spaces)