What is the significance of Reclining Buddha Statue in Laos compared to other countries in Asia?

Hello regarding the reclining Buddha statue here in this link http://www.buddhastatuesnow.com -- What are the differences between this and other reclining statues in Asia? I have seen several and this one is different. For example the fingers are much longer and the Buddha appears happy while in other countries he is more solemn and hands are not so prominent. Thank you for any info you can provide!