For a Google Sheet designed to present two data sets with the structure you've described, clarity and distinction between the sets, categories, and steps are crucial. The palette should enhance readability while keeping the sheet visually appealing and organized. Considering your requirements, here is a color palette tailored for your needs:

### Color Palette: "Data Harmony"

1. **Main Heading 1 (Order Number for Dataset 1)**
   - Color Name: Ocean Blue
   - Hex Code: 
                            
                            #0077CC
                        
   - Description: A strong, trustworthy blue to highlight the main heading of the first dataset, ensuring clear distinction and focus.

2. **Main Heading 2 (Order Number for Dataset 2)**
   - Color Name: Forest Green
   - Hex Code: 
                            
                            #228B22
                        
   - Description: A vibrant, earthy green to differentiate the second dataset's main heading, creating a natural contrast with the first.

3. **Subheading Category 1**
   - Color Name: Lavender Mist
   - Hex Code: 
                            
                            #E6E6FA
                        
   - Description: A soft, light lavender providing a soothing backdrop for subcategories, ensuring they stand out without overwhelming.

4. **Subheading Category 2**
   - Color Name: Honeydew
   - Hex Code: 
                            
                            #F0FFF0
                        
   - Description: A fresh, subtle green, perfect for delineating subcategories with a gentle visual distinction from Category 1.

5. **Step Highlight 1**
   - Color Name: Sunset Orange
   - Hex Code: 
                            
                            #FF5733
                        
   - Description: A warm, inviting orange to highlight individual steps within categories, drawing attention without distraction.

6. **Step Highlight 2**
   - Color Name: Sky Light
   - Hex Code: 
                            
                            #87CEEB
                        
   - Description: A calm, reflective light blue for step highlights in the second dataset, complementing the Sunset Orange and aiding in visual separation between datasets.

**Palette Description:**
"Data Harmony" is designed to bring structured color coordination to complex Google Sheets, utilizing a balanced mix of warm and cool tones to differentiate between datasets, categories, and steps. The selected colors ensure that data is easy to navigate while keeping the visual presentation engaging and distinct. This palette supports efficient data analysis and presentation, making complex information accessible at a glance.