Lemke released three versions of the Liebherr Compact excavators earlier this year. DM Toys has some excellent photos of the two versions that are still available from that source; however, I always find it helpful to see how a new model compares with existing models that I am already familiar with. With that caveat, here are some comparison photos showing the new excavators with some “known” models.
Lemke LC4251 wheeled excavator, F-Toys PC200 (1:150 scale), Wiking HR18 mini excavator and River Point Station F-350 service truck

Lemke LC4254 crawler excavator, F-Toys PC200 (1:150 scale), Wiking HR18 mini excavator and River Point Station F-350 service truck

The Lemke excavators come with a ditch cleaning bucket rather than the “digging” buckets that are on the TomyTec and Wiking models. But I am not complaining, because N scale construction equipment is rare! And, despite the “Compact” in the name, the prototypes are not small excavators.
I found a photo of a prototype 2012 Liebherr A 918 wheeled excavator that appears to be an exact match for the Lemke model. However, I am still looking for the precise prototype for the crawler excavator.