Not even close to the same player.
Miller was a far better technician and a far better pass rusher coming out.
If teams view him as a LBer it will be as an off ball LBer. An Off ball LBer hasn’t went top 10 since 2012 when Luke Kuechly was drafted at 9OA. Kuechly was a far more polished LBer too. He had 191 tackles which was almost double what Simmons had. They are not even close to the same player.
Simmons reminds me more of Derwin James. Who was also an athletic hybrid player. James was projected top 10 for many of the same reasons that Simmons is but James went 17OA. While I think James was a more polished player than Simmons is coming out. Yet Simmons is bigger and faster. Which helps him project more as a LBer which will boost his value some.
I think if anyone drafts Simmons top 10 that they are doing so solely on his potential and upside. It only takes one team to fall in love with his potential but It wouldn’t shock me one bit if Simmons doesn’t go top 10.