XnView Software

I looks like XnConvert is a stripped down version of XnView which the sole purpose is to convert images only and while NConvert does the same but in command line interface. Is there any different in term of converted images quality when using these 2 converters? Which of these 2 converters has most updated converting algorithm, codes and fixes?

Current XnConvert version now works as standalone, but XnConvert use to be a gui for NConvert.exe

I bet all NConvert, XnView and XnConvert uses the same code base so there wont be any difference in image quality between them.