What I mean by Nursery Nurse is someone who works in a Nursery as opposed to a school! I mentioned it as they were two options available to me with the level of qualification I have.
CACHE is the new name for the NNEB www.cache.org.uk It stands for Council for Awards in Children's Care and Education (so why CACHE and not CACCE I don't know!) As Cache, they offer lots of different courses ranging from Introduction to..., through Level 2 (equivalent to 10 GCSEs I think) and Level 3 (equivalent to A levels) and onwards.
I hold the Level 2 Certificate, which allows me to practise in a variety of settings but under supervision. So, I'm technically underqualified as a nanny but would be fine as a Teaching Assistant as long as the Teacher is present in the classroom with me, or a Nursery Nurse reporting to a room leader or supervisor. Hence comparing the two jobs, they are a similar level.
I'm guessing if you are a registered Childminder then you've done the training which would be the equivalent of Level 3 at least! Which'd mean you're more valuable in either post as you're legally allowed to care for children without a "superior" being present.
Whenever I've been jobhunting (which I am at the moment) there are lots of positions available in nurseries and daycare and TA is rarer.
Select Education handle a lot of TA positions and they'd be able to tell you about the pay, etc. I think it does really depend on the school and length of the contract as jellyjelly said..... I guess you could try speaking to some other Education specialist agencies to get an idea and a clearer answer to your question!