Cytoplasmic determinants - protostomes and deuterostomes
The two distinct types you have mentioned in your question (determinate/indeterminate cleavage) are actually called autonomous specification and conditional specification, respectively.

In the case of the former one, if we were to remove a blastomere, it would still produce the previously determined type of cells, while in the case of conditional specification the cells, which are going to be produced, depend entirely on the neighbouring ones. The latter's ability to alter their fate is called regulation.

As for answering your questions, cytoplasmic determinants are spread unevenly in deuterostomes as well, as otherwise no axis could be developed.

You might be interested about this answer as well.

I've used the following book as source: Gilbert, S. (2000). Developmental Biology [ online version ]