90MCV8 is now called 90MnCrV8 according to DIN EN ISO 4957. It is equivalent to the North American tool steel Type O2 (UNS T31502) according to ASTM A 681.
40CMD8 is similar to the North American tool steel Type P20 (UNS T51620) according to ASTM A 681. Both of these are commonly used tool steels, and therefore widely available.