Gaps between the models caused by projection distortion

We want to show a wide range of 3D geological models on Cesium,These models are built in separate blocks using a projected coordinate system,When we convert the models to 3dtiles format and position them according to the center point of the model, There are obvious gaps between the models, We know that this is caused by projection distortion, How to deform and project the model so that it can be seamlessly stitched together when it is loaded into cesium.