I too would say give it a go in whichever house suits you best. Most grannies finish up with duplicate baby equipment, whether bought or borrowed. As they are of an age to still have a nap, you might find yours easier, but only you can say.
However, and this is, in my opinion , important - you and they do need a Plan B in case of illness and you should not be the person to put this in place-if necessary, your DIL might need to take time off work, just as she would for a "paid" childminder . You will love the time with them, you will be helping their parents and most importantly, forging a very special bond with your grandchildren.
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It sounds as though you have a lovely family, so I'm sure things will work out whatever happens.