In my opinion, yes, there is a difference.
In the 80's, a metal band was noted as one when, "metal was the SOUND produced by the musicians instruments. Not the groove mind you, but the sound. "Metal" meant razor sharp, clear, piercing notes from one's guitar. "Metal" was a clean sound. Loud and Proud. Judas Priest was one of the founding bands of the "Metal" sound. When someone thought "Ozzy", "metal" was one of the first words to pop into your head. ("Bat" was probably next). Metal had an enduring beat. A definitive beat. Every artist aspired to produce a song with a beat AND a riff unlike any used before in recorded music. Together with ground-breaking riffs, vocals that ranged from melodic to ear-piercing vibrato screams, and beats that seemed to be hammered out of the steady forge of an iron foundry, metal was molded into a sound that declared in one voice: "IF IT'S TOO LOUD, YOU'RE TOO OLD!" The SOUND was unique to the band. If someone left the band for whatever the reason, the music suffered. They could keep playing, but you could tell something was missing from the music. That whiz, the bang, the zip. It took ALL the members to make that unique sound. Albeit, I must mention that Ozzy, for example, has endured and constantly hires new talent. But, that talent is usually from another well-known band and Ozzy KNOWS his unique sound. It was a unique time for Rock and Roll.
Then something happened:
People liked it. And others tried to copy. But that was the problem. They tried to COPY. Vocalists emerged that sounded like other famous artists. Guitarists began to use the exact same synths and sounds as that of their idols. A drummer became almost something of a passe band member. He's only there because they NEED a beat. And then many others followed suit.
I'm NOT saying that today's "Metal" are a bunch of posers. Not at all. They have a lot of talent and I'm glad to see that at least they are trying to make a living with their music instead of spray painting their gang-member name on the side of somebody's building. I think what has happened is that ORIGINALITY seems to be rather stagnated at the moment. Todays "Metal" is still written by heart, the best way that these musicians know how to, but the "sound as described above" and new originality is missing.
I like some of today's "Metal" but just like the 80's stuff, not ALL of it.
Your question is neither ignorant or stupid.
PEACE