I think the OP is getting confused with HT like issues, where various AVRs or processors may not accept certain audio formats. Generally this isn’t an issue with 2 channel DACs. They all decode mp3, FLAC, ogg vorbis (Spotify). The DAC is the bigger determinant of the sound, but sources matter, as in every other format, so yes there will be a difference between Cambridge, Bluesound, etc, just as no two turntables sound exactly alike.
The terminology gets confusing. Bluesound and Cambridge are essentially streamers, but they do come with internal DACs, and those DACs can be accessed by other digital components, so in a sense they can be referred to as “streaming DACs”. Taking that a step further, a standard computer can also be a streaming DAC.
However, in Audiophilia, products that were created with the emphasis on the streaming capacity, and have DACs that have been added as a convenience or as an afterthought, are generally referred to a streamers. If the emphasis is primarily on the DAC, and a streamer of lesser quality has been added on, we call them DACs.
if the emphasis is equal, streaming DACs.
As mentioned above both Cambridge and Bluesound come with internal DACs. These may not be as good as the DAC owned by the OP,but they aren’t bad. Particularly if the source is going to be lossy, such as Spotify ogg vorbis, the OP may not get much improvement bypassing the internal DAC of the streamer. So if for some reason the streamer and the DAC are incompatible just use the included DAC and rest easy
