Scanned Synth Mini features the same synthesis engine as used by Scanned Synth Pro (they sound the same when using the same presets) but only allows new sounds to be programmed through randomisation. The user can set the amounts by which each group of parameters will be randomised but does not have direct access to the parameters themselves.
Scanned Synth Mini can load and save presets through the host application that are compatible with Scanned Synth Pro and vice versa. This means that Scanned Synth Mini can actually produce the full range of sounds that Scanned Synth Pro is capable of. Only the amount of control the user has over the sound is limited when compared to Scanned Synth Pro.