Is there any difference between "json" and "tojson" filters in jinja for saltstack?

According to saltstack documentation it's "json": https://docs.saltstack.com/en/latest/ref/renderers/all/salt.renderers.jinja.html

But in jinja doc http://jinja.pocoo.org/docs/2.9/templates/#builtin-filters - there is not "json", but "tojson".

Does anybody know why?