Whilst nobody can guarantee your new foods will suit your dogs I will go so far as to say that you seem to have been fiven good advice by your local retailer. Acana is one of but two dried kibbles stocked by my (luckily local) homeopathic vet. Made by champion pet foods it is regarded highly. Acana have a variety of dried kibbles so plenty of choice if you choose to introduce variety later. Orijen is made by same company. Essentially both come from other side of atlantic.
Apparently both produscrs are extruded at a slightly lower temperature than most other dry extruded kibbles - some say less mamipualtion/damage of ingredients & vitamins as a result.
Unless there is a significant tolerance issue I would be gobsmacked if you are not happier feeding this product.
I know that common advice is to gradually introduce new kibbles by adding certain percentages but I have changed kibbles before with little issue. Whatever you decide, As indicated abobe, I would also advise you feed a considerably smaller amount. As well as the dogs having to deal with far higher food quality they will be getting what they prior needed from lesser ammount. However you introduce do perhaps expect some odd dog rear end smells, changes to toileting & looser stools as dogs adjust. Gut flora adjustments can affect things too. Stay with it and be prepared to cut back.
I should also add that you may be suprised to see dogs may not seem so keen onnthe nee food. Bakers has additibes/ingredients that appeal to dogs taste buds...even if some informed feeders might not approve.
Often an oversight but perhaps as good a time as any to also consider how much water you add to your kibble, whether you pre-soak etc. When feeding kibble I prefered to add plenty of water....not be pre-soaking unless dog being fed swallowed without chewing - in which case I would soak to aid digestion & fast forward food breakdown in the dog.
Do keep us posted & let us know how you get on.