It's usually no big deal if a piece of vector art has nothing but bare objects with flat fills, no live effects and all type converted to outlines. That can usually jump from one application to another without anything getting modified. Line strokes and effects applied to those strokes begin to complicate the situation. Live type objects can add more issues. Same goes for clipping masks. Objects with gradient fills can run into big problems hopping from one brand of drawing app to another. The latest version of CorelDRAW is improved at handling Illustrator-style gradients (it even supports transparency now), but it's still not 100% accurate. Some live effects are application dependent; they won't port to other graphics applications at all.