Toyota used double ground plugs in many cars in the 90’s. They were supposed to be good for 60k miles instead of the usual 30k. If you engine runs fine on the single ground electrode plugs, then by all means use them, just change them after 30k.
The dual ground plugs have the gap beside the center electrode, making them fire sideways, where the regular plug is end firing. Most cars don’t care, a spark is a spark, but we have a Tercel (86) that seems to run better with side firing plugs, even though it originally came with single ground end firing plugs. Its the only vehicle that I have that has responded this way.