N190LA along with N160LA are S-70A-33A's. These were originally built for the Royal Brunei Air Force but never delivered. IIRC, the Sultan canceled the order after he and his brother (who originally placed the order) had a falling out.
These two were offered to the LACFD since they were already built. Both were originally built with weather radar and FLIR and I believe stripped from the A/C before delivery. Both have been flying for a couple of years.
LACFD has purchased another S-70A (N15LA), this one being a new-build off the line and is basically identical to an UH-60L.
The other Firehawk shown in the top link, is the original demonstrator that was converted from an UH-60L (I believe 96-26720) on loan from the Army.