A quick & dirty conversion (w/plenty of round-off error) for those of us who still think in Knots, with mph thrown in for groundlings...all speeds as-given:
BF-109G-2 (DB-605A)
546km/h at SL | 295 Knots | 339 mph
BF-109G-5 (DB-605AS)
531km/h at SL | 287 Knots | 330 mph
BF-109G-6 (DB-605A)
536km/h at SL | 289 Knots | 333 mph
BF-109G-6 (DB-605AM)
573km/h at SL | 309 Knots | 356 mph
BF-109G-14 (DB-605ASM)
573km/h at SL | 309 Knots | 356 mph
BF-109G-10 (DB-605DB)
588km/h at SL | 317 Knots | 365 mph
BF-109K-4 (DB-605DC)
603km/h at SL | 326 Knots | 375 mph