Sprites with a fix size (instead of scale)

Question

If I use different sprites they could have different sizes and different scaling factors have to be used

@startuml
!include <office/Concepts/firewall>

sprite $foo1 {
  FFFFFFFFFFFFFFF
  F0123456789ABCF
  F0123456789ABCF
  F0123456789ABCF
  F0123456789ABCF
  F0123456789ABCF
  F0123456789ABCF
  F0123456789ABCF
  F0123456789ABCF
  FFFFFFFFFFFFFFF
}

[Comp1] -> [Comp2] : Testing <$foo1,scale=2>
[Comp1] -> [Comp2] : Testing <$firewall,scale=0.5>
@enduml

Is it possible to define a target size like below? 

[Comp1] -> [Comp2] : Testing <$foo1,size=20>
[Comp1] -> [Comp2] : Testing <$firewall,size=20>

 

Thank you and best regards
Helmut