I looked on the napa website
Both of those cats are CARB-compliant and are approved for 1994-1997 Previa, and were manufactured by magnaflow, as per the information on the napa website
However . . . that is not the end of the story
Every approved aftermarket cat needs to have a visible executive order number. If it’s not visible or missing, you fail
I lookied on the carb website of approved cats. It was a bit tedious, but I determined that both of your cats are approved for your specific vehicle. The executive order number is D-193-103
The exact manufacturer, as per the document is “Car Sound Exhaust Systems, Inc. (d.b.a. Magnaflow)”
There is a phone number at the bottom of the list 1-800-242-4450 . . . it is the air resources board public information helpline. I expect somebody on the other end of that phone will be able to answer your questions, and possibly get you in touch with a referee
BTW . . . here is an interesting cut and paste from D-193-103
New Label Requirements
The label on the catalytic converter shell must be ½ inch high and large enough to be read from a distance of 5 feet from either side of the vehicle. The label must show
the EO, specific part number (universal or direct-fit) for the vehicle, and date of production (month and year)
As I said earlier, if that label is missing or illegible, then the car should technically fail
I suggest you attempt to contact a BAR referee and provide him with all of the paperwork
Expect the worst, but hope for the best
Should this ultimately lead to satisfaction, you owe me a virtual box of crispy cremes . . . !
Obviously, crispy cremes don’t have red glazing, but it’s the only doughnut emoji I could find at the moment
You get the idea 