Can you convert Draftsight files to AutoCad readable files?

The issues starts with me opening up AutoCad drawings on Draftsight, when altering this file and saving it with Draftsight with the extensions provided by draftsight (.DWG or .DXF) I try to re-open this file on AutoCad. The file i open up on AutoCad is not the same I as I saved on Draftsight. Why is this happening? Is there a work around for this? Can I convert a Draftsight file to an AutoCad file so when I open it up on AutoCad it looks like how I saved it on Draftsight?